Can I ask what is the 1337 speaking styke? 1st time i have ever heard about that style...
Leet/1337 speak is to blend letters and numbers to appear overly cool, or "elite"/"leet"/"1337". It's old times "super cool hacker style", but these days everyone that might do this usually comes off as a complete moron.
I think it was cool again a few years back, but then it died again.
So, basically, write a comprehensible English. We have old farts like me that refuses to read something composed of both letters and numbers, or words that are missing half the letters and so on, so forth.